Brighter SSS in Blender Internal
Ok, after some trial and error and reading the Blender Wiki on SSS, I found a solution. It all depends on the Scattering Weight Front and Back parameters. I set them both up to 1.7 and the effect is much more juicy and brighter. As the Blender Wiki explains, these parameters are responsible for how much light is absorbed or added on the front and back side of the object.